Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 26,956	$ 93,862	$ 67,944
Depreciation and amortization	37,877	35,273	31,684
Restructuring charges (Note 2)	11,384	0	0
Stock-based compensation (Note 10)	11,758	9,211	7,599
Pension expense (Note 14)	7,142	6,332	11,955
Currency exchange losses, net	(31,320)	14,393	(1,699)
Loss (gain) on asset dispositions, net	557	(1,453)	(1,745)
Asset Impairment Charges (Note 15)	(4,094)	(3,878)	(4,058)
Other operating expense (Note 19)	5,127	785	2,471
Other operating expense (Note 19)	126,432	0	0
Pension contributions (Note 14)	0	0	4,946
Trade receivables	(6,384)	13,239	(21,959)
Inventories (Note 3)	(30,363)	14,394	(9,403)
Accounts payable and accrued liabilities	(19,424)	(46,957)	19,690
Income taxes receivable, prepaid expenses and other current assets	13,840	(12,853)	(7,584)
Other noncurrent assets and liabilities	80,848	12,546	(44,587)
Cash Flow From Operating Activities	230,336	134,894	55,254
Investing Activities
Capital expenditures	(23,725)	(25,523)	(36,241)
Acquisition, net of cash acquired (Note 13)	(216,308)	(18,449)	(180,271)
Property disposals and other investing	832	18,214	8,022
Cash Flow (Used In) Investing Activities	(239,201)	(25,758)	(208,490)
Financing Activities
Proceeds from short-term debt, net (Note 11)	13	0	5
Payments on long-term debt (Note 11)	(559,767)	(443,572)	(291,525)
Proceeds from long-term debt (Note 11)	637,000	382,664	510,456
Restricted cash	(2,538)	1,505	264
Cash dividends paid	(52,537)	(49,074)	(47,380)
Company stock purchases (Note 6)	(17,513)	(1,881)	(9,885)
Exercise of stock options (Note 6)	18,465	12,476	1,930
Employee stock purchase plan (Note 6)	532	571	488
Proceeds from (Payments for) Other Financing Activities	(590)	(530)	596
Cash Flow From (Used In) Financing Activities	23,065	(97,841)	164,949
Effect of exchange rate changes on cash and cash equivalents	6,285	(3,461)	(11,786)
Increase (decrease) in cash and cash equivalents	20,485	7,834	(73)
Beginning cash and cash equivalents	113,759	105,925	105,998
Ending cash and cash equivalents	134,244	113,759	105,925
Supplemental cash flow information:
Interest payments	15,504	15,861	10,818
Income tax payments	$ 40,376	$ 57,551	$ 50,001